JPS5930061B2 - Food additive for silkworms - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a passenger food additive prepared by adding seaweed or an extract thereof as a growth promoting substance to mulberry leaves for selective rearing of silkworms.

Since ancient times, silkworms have been reared only on mulberry leaves, but in recent years, research into artificial feed has progressed and it has come to the stage of practical use. During the season, they are raised on mulberry leaves.

The growth rate of silkworms reared on artificial feed during the young stage is almost comparable to that of silkworms reared during the young stage on mulberry leaves, although it is slightly inferior.

However, since the selection period is replaced with mulberry leaf rearing, the silkworms are reared normally and the resulting image quality (total cocoon weight,
Cocoon layer weight, etc.) showed results comparable to the image quality obtained by rearing from the young silkworm stage on mulberry leaves.

This result led to the implementation of artificial rearing of silkworms during the young stage, and from this fact as well, mulberry leaves can be considered to be an excellent feed for silkworms, and excellent feed or additives can be used during the culling stage. In addition, it has been shown that the image quality can be improved by breeding.

On the other hand, the image quality in the spring silkworm stage is better than that in the early autumn silkworm stage and late autumn silkworm stage, which means that the leaf quality of mulberry leaves in the spring silkworm stage is also superior to that in the early autumn silkworm stage and late autumn silkworm stage. show that there is
This tendency is the same even when young silkworms are artificially reared, indicating that it is possible to improve the image quality by improving the leaf quality at the selection stage.

The present inventors focused on this point and revealed that image quality could be improved by adding seaweed powder or its extract to mulberry leaves and raising silkworms during the 4th to 5th instars, and the spring silkworm stage. It was revealed that a similar effect was found in

That is, the present invention relates to a passenger food additive containing seaweed or an extract thereof, and the silkworms referred to herein may be any silkworms raised on mulberry leaves or artificial feed during the young stage.

The present inventors first confirmed that seaweed powder or its extracts such as kelp, wakame, morning lettuce, and amanita were ingested. They found that it has the effect of shortening the period, and also discovered that it has the effect of improving and improving image quality.

It is an unexpected fact that silkworms, which have been raised with mulberry as their sole feed, are able to consume seaweed or its extracts, and their growth is stimulated.

Seaweeds include kelp, wakame, sargassum, kashime,
Regardless of the type of red algae, brown algae, etc.
You can use almost any seaweed.

These seaweeds can be given as they are by drying the raw algae and turning it into a powder. , adsorbed to sucrose, starch, etc., and dispersed,
This may be fermented or suspended in water and given by immersing or spraying it on collected leaves.The amount of the extract varies depending on the raw material, extraction medium, and extraction conditions, but is 6 to 12% based on the raw material powder. obtained with a yield of .

The amount of seaweed or its extract added to the collected leaves should be changed depending on the type of seaweed or the stage of growth (0.05 to 5% as dry powder of seaweed at the 4th instar stage, preferably 0.05%). 1-3.5%, but 0.1-1 at 5th instar
It is good to add 0.0%, preferably 0.3 to 5%.

The amount of extract added is calculated in terms of raw material seaweed powder.

In this way, we discovered that adding an appropriate amount of seaweed or its extract to collected leaves in selective rearing of 4th to 5th instars has the effect of increasing the amount of cocoons collected and shortening the rearing period. The benefits seem to be extremely large.

Next, the present invention will be explained with examples.

Example After artificially rearing young silkworms, leaf collection was carried out from 4th instar silkworms.
Seaweed powder or extract was added to the collected leaves.

The seaweed powder is directly sprayed on the collected leaves, and the methanol solution is sprayed and mixed with lactose using the hamethanol extract to remove the methanol and make a lactose triturate.
When used, this was dissolved in water and the water solution was sprayed onto the collected leaves for breeding.

The amount of the extract added was determined in terms of seaweed powder.

The yields of wakame and kelp extracts were 8% and 12%, respectively.

Tests at the 5th instar stage were conducted in the same manner using silkworms that had been artificially reared in the 1st to 3rd instars and grown on mulberry leaves (no additives) in the 4th instar.

The rearing results and image quality results at the time of 5th instar silkworm development are compared with those without additives and are shown in the table.

The test was conducted with 100 silkworms in each group, and the silkworm varieties used were Guntoyo x Shutama.

As shown in this table, both silkworm shape and image quality showed superior results compared to those without additives, but there was no difference in overall breeding progress and silkworm reduction rate compared to the control.

Claims (1)

[Claims] 1. A food additive for selection that is used by adding to mulberry leaves made from seaweed or its extract.